Reversing starter for 60 mm busbar systems
The Siemens 3RA2220-4BD27-0AP0 is a SIRIUS reversing starter in Size S0, combining a contactor reversing pair and overload relay in one unit that snaps directly onto 60 mm busbar systems.
Mounting and clearance constraints
Designed for vertical mounting on 60 mm busbar systems, the 90 mm width and 260 mm height fit standard S0 feeder footprints; depth is 155 mm including the contactor and link module. Required clearances: 50 mm upward, 32 mm forward, 10 mm sideways, and 10 mm downward — plan these into the enclosure layout to avoid thermal recirculation and maintain the -20 to +60 °C operating range. The supplied contactor (3RT2027-1AP00) and link module (3RA2921-1AA00) are pre-assembled; main circuit connections use screw-type terminals, so torque the connections to the values in the product drawing during installation.
Rated at multiple voltages
Horsepower ratings span from 3 hp at 230 V to 20 A at 480 V (15 hp) and 20 A at 600 V — the 7.5 hp at 400 V (7 500 kW appears to be a data artifact; the 20 A at 400 V figure governs the motor sizing decision). Rated insulation voltage is 690 V, and the unit withstands storage and transport from -50 to +80 °C — the -20 to +60 °C operating range with temperature compensation covers most indoor industrial environments.
For volume purchases or scheduled releases, lead time and pricing are confirmed at RFQ; the unit can be specified into new designs or used as a direct replacement for existing SIRIUS S0 reversing starter installations.